Just got back from salon. I have terrible allergy to ppd and after the last visit to salon using a product that has only minimal ppd had a very bad reaction. Researched Sanotint light and took a chance. I ordered several colors, printed out the color chart and went to my hair dresser. She used the extra light golden blonde and i was very happy with the results. So far, no scalp flare up. If this works, I will be forever grateful to Sanotint because I am not ready to go grey.